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Developer tools · #linux
A concise, step‑by‑step diagnostic guide for the SSH "Permission denied (publickey)" error. It covers client key checks, server configuration, permissions, and escalation paths.
Use SSH multiplexing (ControlMaster) to reuse a single TCP connection for multiple sessions, cutting login latency and CPU overhead. Configure ControlMaster, ControlPath, and ControlPersist in ~/.ssh/config and verify with ssh -O check.
Learn how to configure kdump to capture vmcore files during Linux kernel panics. This guide covers GRUB memory reservation, kexec validation, and triggering test panics.
Learn why Debian Stable freezes package versions to ensure infrastructure stability, how security backporting works, and how to selectively use backports with APT.
Learn how to verify and use Podman’s rootless mode to run containers without sudo, including checks, a worked example, and known limitations.
io_uring can reduce syscalls for I/O-heavy Linux services, but it only pays off when syscall overhead is measurable. This post shows the shared-ring model, a minimal liburing file-serving loop, and how to check kernel support and policy before adopting.
A decision guide for choosing WSL 1 vs WSL 2 on Windows 11: compare architecture, file I/O, networking, GUI support, and get concrete commands to set defaults, convert distros, and validate performance.
Learn when to enable TCP Fast Open, compare the sysctl options, understand the trade‑offs, and apply and verify the setting on a Linux host.
Use cgroup v2 PSI memory.pressure triggers or systemd MemoryPressureWatch to start a graceful shutdown while your service still has memory to clean up — before the OOM killer decides for you.
ssh
debian
podman
windows11